Cecil Moore wrote:
Gene Fuller wrote:
Oops, I am afraid I must retract my previous congratulatory progress
report. You are obviously still confusing phasors with field vectors.
Until you get that terrible misconception sorted out, there is no hope
for further progress.

Let's skip your objection for the moment and let you
answer this simple technical question.

Poynting vector = ExH = E*H*sin(A)

Incorrect. The Poynting vector is defined as E x H*. The vector
directions are critically important. It is absolutely incorrect to try
to reduce to some scalar type equation. (The '*' means complex
conjugate, but this detail is not always important.)

The Poynting vector for a pure standing wave = 0.

Says who? Perhaps the time and space averages or "net", whatever that
means, but not the local instantaneous Poynting vector.


It is always zero even when both E and H are not zero.

Nonsense. It is E x H* at every point. If E or H is zero then the
Poynting vector is zero. Otherwise it will not be zero.


So here is the question for you. Assuming that neither
E nor H is equal to zero:

When E*H*sin(A) = 0 (Poynting vector)

What are the possible magnitudes of angle 'A'?

This is a simple technical question having absolutely
nothing to do with confusing phasors with field vectors.

Please provide an answer.

The answer is that you have started with incorrect equations.


I assume that Hecht covers the equations and such.

Yes he does. He also recognizes when the EH fields
incident upon a plane can be validly represented by
phasors. Apparently, Hecht also "confuses phasors
with field vectors". (SIC)

You have obviously misunderstood what Hecht is saying. A phasor does not
carry any vector information. It is a representation of magnitude and
phase angle only. That says absolutely nothing about the direction of
the field vector. The phase angle is completely unrelated to the vector
direction of the E-field and/or H-field.

73,
Gene
W4SZ